Surname Khainak (Khainak 
, Хайнак 
) , throughout the world, is a rare last name. The cognomen Khainak is habitual in Ukraine, where it is a rare surname, Thailand, and Russia, where it is a very rare surname. Very seldom, Khainak is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Khainak | Thailand, India |
| Хайнак | Russia, Ukraine |